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Sonondegradation of organophosphorus pesticides in water

100%

Dehghani M. H. , Fadaei A.

Environment Protection Engineering

2013

tom Vol. 39, nr 4

5--14

Organophosphorus pesticides (OPPs), such as diazinon and malathion, are widely found in water resources. When absorbed by human organisms, OPP s are very toxic mainly because they deactivate acetyl cholinesterase. In the present study, the degradation of diazinon and malathion was investigated. The experiments were conducted for diazinon concentrations of 100, 300, 500 μg/dm3 and malathion concentrations of 200,400,600 μg/ dm3. Sonochemical examination was done using an ultrasonic reactor at 130 kHz and 500 NW for five times, and then the amount of the pesticide in a sample was measured by the gas chromatography with a flame ionization detector (GC-FID).The highest degradation of malathion and diazinon by the sonolysis process occurred at pH 9 and 3, respectively. The study demonstrates that malathion and diazinon could be effectively degraded by ultrasonic irradiation.

Photocatalytic reduction of hexavalent chromium in aqueous solutions with zinc oxide nanoparticles and hydrogen peroxide

70%

Assadi A. , Dehghani M. H. , Rastkari N. , Nasseri S. , Mahvi A. H.

Environment Protection Engineering

2012

tom Vol. 38, nr 4

5--16

Photocatalytic reduction of Cr(VI) to Cr(III) in aqueous solutions under UV irradiation and ZnO semiconductor catalyst was investigated using potassium dichromate as a model compound. The effects of pH, catalyst dose (0.05-0.15 g/dm3), Cr(VI) initial concentration (0.1-15 mg/dm3) and hydrogen peroxide concentration on photocatalytic reduction of Cr(VI) were investigated. The reduction rate of chromium was more favorable in acidic solution. Hydrogen peroxide was added as a reduction reagent for enhancement of the photoreduction. The process of photoreduction of Cr(VI) approximately followed first-order kinetics. Drinking water samples and wastewater were collected and photocatalytically treated for reduction of Cr(VI).